Camera: fix number of cameras logic

Test: no Camera CTS regression
Bug: 36289841
Change-Id: I7218347a0f2e8184dd43a9f35acc0554b761e15e
diff --git a/services/camera/libcameraservice/common/CameraProviderManager.h b/services/camera/libcameraservice/common/CameraProviderManager.h
index b1da831..04b9597 100644
--- a/services/camera/libcameraservice/common/CameraProviderManager.h
+++ b/services/camera/libcameraservice/common/CameraProviderManager.h
@@ -292,6 +292,7 @@
             static status_t setTorchMode(InterfaceT& interface, bool enabled);
         };
         std::vector<std::unique_ptr<DeviceInfo>> mDevices;
+        int mUniqueDeviceCount;
 
         // HALv1-specific camera fields, including the actual device interface
         struct DeviceInfo1 : public DeviceInfo {